BIGELOW: EXPLORATIONS IN THE GULF OF MAINE. 79 
densities for Stations 6 and 5 with those of 45 and 46 it is evident that 
vertical stability in Massachusetts Bay decreases with the advance 
of the season; pointing to the inversion which no doubt takes place 
there in winter. 
A profile from Boston (Station 6) northeastward to German Bank, 
wa Jeffrey’s Bank (Station 25), and Station 31 (fig. 37) shows the 
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relative distribution of lighter and heavier water over the northern 
part of the Gulf. Above the two deep basins heavy water, distin- 
guished arbitrarily by the curve of .026, rose close to the surface, 
whereas over the two banks the whole column of water was of lower den- 
